(With a cry, the DOCTOR swiftly kicks the device out of the MASTER'S hand. He then kicks the MASTER in the stomach and the renegade falls back to the ground
before he can fire his laser gun. As this tussle takes place, the entrance to the Primitive City creaks out and one of the PRIESTS stands in the doorway. At the
same time, several Primitives appear from each side with their spears pointed at the DOCTOR and the MASTER. The Time Lords stop their fight and stand prisoner.
One of the Primitives picks up the MASTER'S gun and they are then pushed forward towards the entrance and into the city.)

2: INT. MASTER'S TARDIS. CONSOLE ROOM

(JO continues to shout from within he cubicle but the door effectively covers her shouts. Whilst MORGAN impassively watches, CALDWELL tries various controls
on the console in an effort to free the girl.)

CALDWELL: Ah, it's no use, I can't see...

(He activates another control and the cubicle door buzzes.)

CALDWELL: Just a minute!

(He rushes to the cubicle, pulls open the door and helps a gasping and coughing JO out. She stumbles across the floor straight into MORGAN'S grasp.)

MORGAN: Where is the Adjudicator?JO: He's not the Adjudicator, he's a fake!MORGAN:(Shouts.) We know that! Where is he!CALDWELL: Calm down - take it easy!

(CALDWELL pulls JO away from MORGAN. He speaks quietly to her.)

CALDWELL: Where could he have got to? Do you know?JO: He went with the Doctor.MORGAN:(Shouts.) Where!JO: To the Primitive city.

3: INT PRIMITIVE CITY. PASSAGE

(The MASTER and the DOCTOR are led in silent procession along a passage in the city. At the head of the group, a PRIEST reaches a doorway, which opens, and
the group moves in.)

4: INT PRIMITIVE CITY. ARCHIVE ROOM

(They are in the same room that the DOCTOR and JO were held in before. The PRIEST stands still with his back to the group. The MASTER walks up to him and
addresses him...)

CALDWELL: I'm afraid I can't help you.DENT:(To JO.) I understand you've been to this Primitive City?JO: Yes, and we only just got out alive.MORGAN: She has told me how to get there. I could take some men and hunt them down.DENT: No, you're needed here. I'll send a squad after them once we've got rid of these people. Things are going too slowly - get them moving!

(MORGAN nods and moves off.)

CALDWELL: What about this girl?DENT: She goes with the colonists.

(He starts to walk out of the dome. JO shouts after him.)

JO: Look, I'm not a colonist! I've got to find the Doctor.DENT: Put her with the rest!

(DENT leaves the dome. JO turns back to CALDWELL.)

JO: You must help me - please!CALDWELL: You heard what Captain Dent said - get on that ship.JO: You've...got to find the Master and stop him - for everyone's sake!CALDWELL: There's nothing I can do.JO: Let me go. If we can find the Doctor, we may be able to stop him.

(MORGAN comes back.)

MORGAN: Caldwell, you were told to put her on the ship.CALDWELL: All right, Morgan, all right.

(He takes JO by the arm.)

MORGAN:(Shouts.) Caldwell, you're still under my discipline, even if you are an engineer - now you remember that!CALDWELL: Who could forget it! (To JO.) Come on you.

(He leads her out of the dome.)

JO: Oh, please, you've got to...CALDWELL: You've given me enough trouble, now get on that ship when you're told!

6: EXT. MAIN DOME

(They walk out of the dome. where there is a parked IMC buggy.)

JO: Please listen to me!

(CALDWELL looks round and then points to a metal tarpaulin, which covers the rear compartment of the buggy.)

CALDWELL: Get under there. Move, quick before I change my mind!

(JO dives under the tarpaulin and MORGAN gets in the drivers' seat.)

7: INT PRIMITIVE CITY. ARCHIVE ROOM

(The DOCTOR and the MASTER are still looking at the pictograms.)

MASTER: That's absolutely fascinating! The whole story is here!DOCTOR: Is it? Well, perhaps you'd be kind enough to explain it to me?MASTER: Well, this city was once the center of a great civilization.DOCTOR: Yes, I had rather gathered that.MASTER: By genetic engineering, they developed a super-race. Now that priest we saw must be a remnant of it.DOCTOR: You deduced all that from these pictures?MASTER: Well, not exactly, I...I knew it already. The files of the Time Lords are very comprehensive.DOCTOR: Ah, so that's more like it. You mean that you stole the information?MASTER: Well, it seemed an awful pity not to make use of it, you know? Well of course, that's typical of the High Council of the Time Lords - know
everything, do nothing!DOCTOR: Tell me, why are you so interested in the history of this planet?MASTER: Well, this super-race developed a Doomsday Weapon - it was never used.DOCTOR: Why not? Super-weapons usually are eventually.MASTER: Who knows? Maybe it was due to a...a degeneration of the life strain.DOCTOR: I see. And so the super race became...priests of a lunatic religion worshipping machines instead of gods.MASTER: So it would seem.DOCTOR: Well, may I remind you that their religion embraces sacrifice...and that we are the destined victims?

(The MASTER looks thoughtful at this statement...)

8: INT PRIMITIVE CITY. PASSAGE

(An ALIEN PRIEST, carrying a staff of office, leads a small procession of Primitives down a passage towards the room in which the DOCTOR and the MASTER are
held.)

9: INT PRIMITIVE CITY. ARCHIVE ROOM

DOCTOR:(Shocked.) You're going to use this weapon?MASTER: Not unless it's absolutely necessary. Well, don't you see, Doctor? The very threat of its use could hold the galaxy to ransom.

(The door to the room starts to open.)

DOCTOR: I think you've left it a trifle late.MASTER: Doctor, you underrate me.

(Out of sight of the beings entering the room, the MASTER shows the DOCTOR a small gas mask and gas bomb he is holding.)

DOCTOR: What about me?MASTER: Try holding your breath!

(The ALIEN PRIEST gestures with its staff and then walks up to the DOCTOR. The MASTER puts the mask to his face and throws the gas bomb down. The aliens
start to choke and collapse. The DOCTOR clamps a handkerchief to his face as the MASTER snatches his laser weapon from a falling Primitive. The DOCTOR and the
MASTER run out.)

10: INT PRIMITIVE CITY. PASSAGE

(Outside the room, the DOCTOR coughs into his handkerchief as the two Time Lords move down the corridor.)

11: INT. MAIN DOME. ENTRANCE HALL

(MARY ASHE counts off the last of the colonists on a clipboard as they collect their belongings under the eyes of the IMC men and move out of the dome.
MORGAN goes up to her.)

MORGAN: Is that the last of them?MARY ASHE: Yes, they're all on board now.

(MORGAN takes the clipboard off her and looks down the list.)

MORGAN: That troublemaker - Winton.MARY ASHE: Well?MORGAN: You've checked him off. I didn't see him.MARY ASHE:(Coldly.) He's been on board some time. He's trying to get the engines working properly.

(DENT calls over from near the radio pen.)

DENT: Morgan.

(MORGAN thrusts the clipboard back at her and goes over to his captain.)

DENT: Where's Caldwell?MORGAN: Well, he's keeping out of the way in case he has to see anything unpleasant.DENT: He'll be all right once we've got rid of these people.

(ASHE walks into the dome.)

ASHE: Mary?

(His daughter runs up to him but DENT also joins them.)

DENT: Ready to go?ASHE: You're sending us to our deaths.DENT: Oh, nonsense. My engineer checked your spaceship - it's sound enough.ASHE: How are you going to explain to Earth government if something happens to us?DENT: There will be no explanation. Once you're off this planet, you're no longer my concern.ASHE: I think you're forgetting one thing, Captain Dent.DENT: Really?ASHE: I'm the only qualified space pilot left in this colony. Suppose I refuse to blast off?DENT: Then you can sit in your ship till you rot. Try to get out and you'll be shot on the spot.

(ASHE nods, puts his arm round MARY and leads her out of the dome.)

MORGAN: Suppose they do try to get out.DENT: Put a man with a communicator on that hill overlooking the dome. If they do try to leave the ship, he can call up a security squad.MORGAN: Very well.

(They leave the dome.)

12: INT PRIMITIVE CITY. PASSAGE

(Having recovered from the gas, the DOCTOR and the MASTER run along the dark passages of the city. The DOCTOR stops and waits for the MASTER to catch up. He
has a map of the city.)

DOCTOR: Which way do we go now?

(The MASTER looks at his map and points down a side passage. The DOCTOR starts to run off.)

MASTER: Wait, Doctor!

(The MASTER has spotted a strange wall marking. He consults his map again.)

MASTER: Yes, we're very near to our goal now. You will soon see the most powerful weapon ever created.

(He gestures ahead with his laser weapon and they move off.)

13: EXT. COLONIST'S ROCKET

(ASHE and MARY stand within the doorway of the rocket pulling in their final supplies with some IMC men. MORGAN walks up.)

MORGAN: Is everyone aboard?ASHE: Yes.MORGAN: Very well. Start your final checkout. (To an IMC man.) Take the buggy back to the ship.

(ASHE presses a button and the rocket door closes on them with a hum. The IMC men move off.)

14: INT. MAIN DOME. ENTRANCE HALL

(DENT stands alone in the deserted dome entrance hall. As he looks round his newly conquered area, he sees something he dislikes and, in an unusual show of
emotion, storms over to the wall and tears a crop chart down. MORGAN walks in.)

MORGAN: They've just started final check-up.DENT: Have the guards been posted?MORGAN: Yes - and the other guards have returned to the ship.DENT: We'd better get back - just in case.

(Screwing up the wall-chart, DENT walks out of the dome, followed by MORGAN. They both fail to spot a figure that comes crawls of hiding at the top of the
stairs and watches them go - it is WINTON.)

15: EXT. UXARIEUS

(An IMC man - Rogers - keeps watch on the dome and the colonists' rocket from a distance. He raises his binoculars and looks through them at the two
structures. He sees no movement. Suddenly, DENT comes through on his radio.)

DENT: No attempts to leave the ship, mm?ROGERS:(OOV: Over radio.) No sir.DENT: If anything happens, anything at all, I want to know at once. Captain Dent out.

17: EXT. UXARIEUS

(Rogers puts the radio down and continues his watch through the binoculars. So intent is he on his task that he fails to see WINTON creeping up behind him
through the grey rocks. WINTON is almost upon him when Rogers stands and sees him. WINTON punches him and Rogers falls back into a pool of light grey watery
mud. Before he can get to his feet, WINTON jumps down and the two men struggle. They get to their feet but WINTON again punches Rogers into the quagmire. WINTON
struggles over to him but Rogers manages to push him off. This time it is Rogers who is first to his feet and he lands WINTON a huge punch, which sends him
flying. Rogers jumps on him to finish him off but WINTON manages twice to push Rogers' head below the surface of a pool of white water. The two men, getting
exhausted with their struggle get to their feet but WINTON is again the first to land a punch that this time knocks Rogers unconscious.)

18: INT. IMC ROCKET. CONTROL ROOM

(DENT paces the control room impatiently. MORGAN sees this.)

MORGAN: Shall I call up the guard again?DENT: Yes.

(MORGAN goes over to the radio set. He is about to press the button, when...)

DENT: No. Can you get the colonist's ship on video-link?MORGAN: I can try.

(MORGAN presses a button and the opaque screen in the center of the room activates and fills with a close-up picture of ASHE in the control room of the
colonist's rocket. He wears a headset and microphone.)

MORGAN: The best I can do I'm afraid.DENT: Mmm.MORGAN: Their equipment's pretty ropy.DENT:(To the screen.) Ashe? Are you receiving me? Captain Dent speaking.

(ASHE turns to his on-board camera.)

ASHE:(On monitor, impatiently.) Yes, I'm receiving you.DENT: What's the delay?ASHE:(On monitor.) An electrical fault in our life support system. We're repairing it now.DENT: How much longer?

(ASHE looks towards another person who is outside the camera range. He nods and turns back to the camera.)

(The IMC buggy carrying CALDWELL and JO - now in the passengers' seat - drives up to the upturned buggy abandoned by the DOCTOR and the MASTER. They stop and
run over to examine the vehicle.)

JO: Do you think they were hurt?CALDWELL: They must have been thrown clear.JO: Or else they've gone ahead on foot.

(They are interrupted by a roaring noise. They turn and look in the direction the sound is coming from.)

20: EXT. MAIN DOME

(The engines of the colonist's rocket fire and the sleek craft starts to rise off its launch pad.)

CALDWELL:(OOV.) It's the colonist's spaceship!

21: EXT. UXARIEUS

CALDWELL: They've made it!

(They smile in delight but the rocket is hardly into the sky when it is rent by a huge blast and explodes into pieces. JO buries herself in CALDWELL and he
closes his eyes against the flare of the blast. JO turns and looks.)

JO:(Distraught.) All those people...

(She walks off. CALDWELL is overcome with guilt and emotion and tears appear in his eyes.)

CALDWELL:(To himself.) And I told them the motors were all right.

22: INT PRIMITIVE CITY. CONTROL ROOM

(The door to the control room opens and the DOCTOR is led in at the MASTER'S gunpoint. The MASTER looks round in satisfaction.)

MASTER: Wait, Doctor. This is it.DOCTOR: Is it? Well where is this super weapon of yours.MASTER: We're in the heart of it. It stretches for miles all round us. Look, let me try and explain how it works.

(The MASTER goes over to a console. He puts down his map, which also seems to have other instructions, which he consults.)

MASTER: Yes.

(He presses a control and, on the other side of the room, behind the DOCTOR, a screen, which seems to be made out of the same material as the doors, slides
upwards. Behind it is displayed a large monitor on which is displayed a star-scape.)

MASTER: Look!

(The image closes in on one star.)

MASTER: That, Doctor, is the sun that gives life to the planet Earth that you hold in such affection.DOCTOR: I do know a little basic astronomy.MASTER: Then you will know that, one day, that sun will burn through to its core and explode.DOCTOR: In about ten thousand million years time, yes.MASTER: Well, with this weapon, I could make that happen now!DOCTOR: That's unbelievable!MASTER: You know the Crab Nebula?DOCTOR: The cloud of cosmic matter that was once a sun, of course.MASTER: That was the result of the super race testing this weapon!

(The DOCTOR starts to look concerned.)

23: EXT. PRIMITIVE CITY ENTRANCE

(JO and CALDWELL'S buggy speeds into the gully and up to the closed entrance to the city. It stops.)

JO: Well, this it.

(CALDWELL stops the engine and gets out of the buggy. He goes up to the door and tries to pull it open but fails.)

CALDWELL: How do we get in?JO: I don't know. The Doctor and I were taken in. There must be some way of opening it?

(CALDWELL tries again on both side of the door but is just as unsuccessful. He turns back to JO.)

CALDWELL: Beats me. We'll have to find another entrance.

(Behind him, the doorway starts to creak open.)

JO: Look!

(CALDWELL reacts instantly, rushing to hide out of view. From within the city, an armed PRIMITIVE emerges. It sees JO and walks towards her, its spear
raised. CALDWELL jumps out of hiding and clubs the PRIMITIVE to the ground. JO dashes out of the buggy and runs into the city whilst CALDWELL holds the closing
door open. He then follows JO inside and the door closes as the PRIMITIVE starts to recover from the blow.)

24: INT PRIMITIVE CITY. PASSAGE

(JO and CALDWELL make their way down a passage. CALDWELL has his gun raised. JO looks round and then points down a side passage.)

JO: I think it's this way, let's try.

(They move off in the indicated direction. After they have gone, a Primitive appears at the other end of the passage.)

25: INT PRIMITIVE CITY. CONTROL ROOM

DOCTOR: So, you intend to hold the universe to ransom?

(The MASTER walks over to him, his laser gun lowered.)

MASTER: Doctor, why don't you come in with me? We're both Time Lords, we're both renegades. We could be masters of the galaxy! Think of it, Doctor.

(The DOCTOR starts to scratch his chin, looking as if he is pondering the offer.)

MASTER: Absolute power! Power for good. Why, you could reign benevolently, you could end wars, suffering, disease. We could save the universe.

(The DOCTOR'S face clears.)

DOCTOR: No, absolute power is evil.

(The MASTER raises his gun.)

MASTER: Consider carefully, Doctor. I'm offering you a half-share in the universe.

26: INT PRIMITIVE CITY. PASSAGE

(CALDWELL and JO run down the passage which is intersected by buttresses.)

CALDWELL: Well?JO: I don't know.CALDWELL: We're lost.JO: Yes.

27: INT. MAIN DOME. ENTRANCE HALL

(MORGAN stands in ASHE'S old office, looking at a clipboard hung on a wall. DENT enters.)

DENT: Morgan, where's Caldwell? None of the other miners have seen him.

(He sits at ASHE'S desk.)

MORGAN: One of the guards saw him leaving the dome in a space buggy. He was heading for the Primitive City.DENT: Take a squad and get after him.MORGAN: Is he worth the trouble?DENT: Caldwell's our mining expert and don't you forget it. We can't do without him.MORGAN: What about that Doctor and the fake Adjudicator?DENT: The only one we need is Caldwell.MORGAN: There will be trouble about those colonists, you know.DENT: We offered to check their ship to make sure it was safe. They refused our help. It's all in my report.MORGAN: Of course.

(MORGAN smiles and leaves.)

28: INT PRIMITIVE CITY. CONTROL ROOM

MASTER: You must see reason, Doctor.DOCTOR: No, I will not join you in your absurd dreams of a galactic conquest.MASTER:(Exasperated.) Why? Why?! Look at this...

(The MASTER returns to the console and adjusts the view on the monitor. It expands to show numerous star fields.)

MASTER: Look at all those planetary systems, Doctor. We could rule them all!DOCTOR: What for? What is the point?MASTER: The point is that one must rule or serve - that's a basic law of life! Why do you hesitate, Doctor? Surely it's not loyalty to the Time Lords,
who exiled you on one insignificant planet?DOCTOR: You'll never understand, will you? I want to see the universe - not rule it!MASTER: Then I'm very sorry, Doctor!

(He raises his laser gun and takes aim. Suddenly, the panel over the sacrificial hatch starts to rise and the GUARDIAN is revealed again.)

MASTER: What's happening?DOCTOR: Wait and see!

(The GUARDIAN'S chair structure moves out from the alcove.)

MASTER:(To the DOCTOR.) What is it?DOCTOR: The ultimate development of life on this planet.GUARDIAN:(To the DOCTOR.) Why have you returned?

(The GUARDIAN looks at the MASTER.)

GUARDIAN: What do you want here?MASTER: I want to restore this city and this planet to their former glory.DOCTOR: Don't listen to him, sir.MASTER:(Passionately.) You have here a wonderful weapon! Why with it you could bring good and peace to every world in the galaxy!DOCTOR: On the contrary, he'll bring only death and destruction.MASTER: This planet of yours could be the center of a mighty empire! The greatest that the cosmos has ever known!DOCTOR: Tell me, sir, has this weapon of yours ever brought good to your planet?GUARDIAN: Once the weapon was built, our race began to decay. The radiation from the weapon's power source poisoned the soil of our planet.DOCTOR: Exactly. The weapon has only brought death - and yet he wants to spread that death throughout the galaxy! Unless you destroy this weapon,
sir, he will use it for evil.MASTER:(Shouts.) No! You must be mad! Why with this, we could control every galaxy in the cosmos! We could be gods!GUARDIAN: You are not fit to be a god. I sense...that if you have control of this weapon, you will bring only unhappiness and destruction to the entire
universe.MASTER: Then die!

(He points his laser weapon at the GUARDIAN but before he can use it, the device disappears into thin air. The MASTER is dumbfounded.)

GUARDIAN:(To the DOCTOR.) There is a self-destructor mechanism. You will please operate it.DOCTOR: Not only does justice prevail on your planet, sir, but also infinite compassion.

(The DOCTOR goes over to a console and touches a device, looking at the GUARDIAN for confirmation. It shakes its head. The DOCTOR touches a lever and the
GUARDIAN nods. The DOCTOR pulls the lever. Immediately, the room starts to shake and the rumble of power builds up.)

GUARDIAN: You must leave at once, or you will be destroyed with the city!

(The MASTER needs no second bidding and makes a dash for the door. The DOCTOR follows but stops briefly.)

DOCTOR: Thank you, sir.

(He runs out. Behind him, the GUARDIAN starts to thresh in its chair as the power within the weapon starts to go out of control.)

29: INT PRIMITIVE CITY. PASSAGE

(In the passages, the Primitives and PRIESTS stumble about, as if the weapon and its power are a very part of their being. They all seem to be heading
towards the control room. The MASTER runs past them, but the DOCTOR hesitates to shout a warning...)

DOCTOR: Come back, you'll all be killed!

30: INT PRIMITIVE CITY. ANOTHER PASSAGE

MASTER:(To the DOCTOR.) Come on! Do you want to die with them?!

(The DOCTOR runs after the MASTER and they both run into JO and CALDWELL at the other end of the shaking passage.)

DOCTOR: Jo, what are you doing here?!JO: Looking for you!DOCTOR: We've got to get out of here at once! The whole place is going up! (To the MASTER.) You had a map - give it to me.MASTER: You fend for yourself!

(He tries to make off but CALDWELL grabs him and holds his gun up to him.)

CALDWELL: Help that man!

(The DOCTOR pulls the map out of the MASTER'S pocket, consults it and looks round.)

DOCTOR: I think this is it, come on.

(He moves off through a small opening in the rock wall, followed by JO, the MASTER and CALDWELL.)

31: EXT. PRIMITIVE CITY EXIT

(They emerge from a small round opening at the base of a cliff, which appears to be another way out of the city. The sound of the rising power can still be
heard. They all dash for safety just as an enormous explosion bursts out of the opening. The DOCTOR and JO have made safety behind a rock and the MASTER and
CALDWELL do the same just as their is a second cataclysmic explosion which brings part of the rock face down across the opening. The immediate danger over, the
MASTER makes a grab for CALDWELL'S gun but he fends him off and points the gun at him. They are suddenly startled by a voice.)

MORGAN: Get up! All of you, get up!

(It is MORGAN and an armed squad of IMC guards.)

MORGAN: Caldwell, come over here.

(MORGAN runs over and joins them as the DOCTOR and JO rise out from behind their rock. The MASTER assumes the countenance of the Adjudicator and walks over
to the IMC men.)

MASTER: You've arrived just in time. Put these people under arrest.MORGAN: Get back to your friends.MASTER: You don't understand. I am the Adjudicator.MORGAN: You're an imposter. We don't need you.

(The DOCTOR, JO and the MASTER run for cover along with the IMC men. Again, a furious gun battle erupts between the two sides. One IMC man is hurt and is
soon followed by a colonist. Another colonist soon falls but they have the advantageous position and WINTON is able to dispatch MORGAN. The MASTER uses the
diversion as an opportunity and sneaks away unseen from the battle. The IMC men start to run out of ammunition and one makes a break for it. The MASTER drives
off in an IMC buggy. WINTON sees that few IMC men are left alive. He stops his own men firing and calls out to their opponents.)

WINTON: Surrender the rest of you - you won't be killed.

(The two IMC men left alive take his good advice, drop their weapons and walk forward, arms raised. The colonists rush down the slope to take them prisoner.
JO looks behind them and sees who's missing.)

JO: The Master - he's gone!

(She and the DOCTOR rush off. The colonists search the IMC men for concealed weapons as the DOCTOR and JO climb into another buggy and drive off.)

32: INT. MASTER'S TARDIS. CONSOLE ROOM

(The MASTER runs into his TARDIS, closes the doors and switches on the scanner. On it he sees the DOCTOR and JO approaching in the buggy. He moves back to
the console and starts the dematerialization sequence.)

33: EXT. UXARIEUS

(The DOCTOR stops the buggy and points.)

DOCTOR: Look!

(The red Adjudicator rocket vanishes into thin air with the normal take-off sound of a TARDIS.)

34: INT. MAIN DOME. ASHE'S OFFICE

(Later, WINTON sits behind ASHE'S desk as he confers with the DOCTOR and JO.)

DOCTOR: Now look, stop worrying. It was the radiation from that weapon that was poisoning the soil. Your cover crops will grow now.WINTON: Yes, well...let's hope you're right.JO: You know, I still don't understand why you weren't in that ship when it blew up?WINTON: Well, we knew the IMC would have to get clear before we blasted off. I hid in the dome; I...knocked out the guard and let the others out.JO: Yes, but it took off and blew up - I saw it.

(WINTON looks guiltily at the DOCTOR who guesses the answer.)

DOCTOR: Ashe?WINTON: He took it up alone.JO: But he must have known!WINTON: The rocket had to take off! It was the only way that we could get IMC out of the way.DOCTOR: And Ashe insisted on staying on board?

JO: The TARDIS!DOCTOR: (To WINTON.)My dear chap, this is absolutely splendid! Where did you find it?WINTON: In one of the dwellings a few miles from the dome. There was a lot of stuff there that the Primitives have stolen.DOCTOR: Well I cannot tell you how grateful I am.WINTON: Doctor, what is it?DOCTOR:(Nervously.) What is it? Well, erm, it's, err...it's a sort of antique really. Err, but err, it does have great sentimental value. Will
you excuse us?WINTON: Yes, of course.

(He spots MARY ASHE over the other side of the hall and goes over to her.)

WINTON: Mary?

(The DOCTOR points to the TARDIS and then gives a goodbye wave to a delighted JO to indicate that they should leave. She and the DOCTOR go inside the TARDIS
as CALDWELL comes out of the radio pen and joins WINTON and MARY.)

CALDWELL: We've had a reply from Earth. They're sending an Adjudicator.WINTON: A genuine one, I hope?CALDWELL: This time, yes.WINTON: What about you, Caldwell? You're finished with IMC. You can never go back to Earth.CALDWELL: I don't think I want to.MARY ASHE: You want to stay here?CALDWELL: Well, if you've a place for an out-of-work miner, yes.WINTON:(Smiles.) All right. We'd be glad to have you.

(CALDWELL looks at the chart that WINTON is holding.)

CALDWELL: Well, for a start, I can help you with your power...

(They are interrupted by the sound of the TARDIS engines. They spin round and see the police box vanish. They look at each other in amazement.)

36: INT. UNIT HQ. LABORATORY

(The BRIGADIER stands in the DOCTOR'S laboratory.)

BRIGADIER LETHBRIDGE STEWART: Doctor...come back at once!

(...and, as if on cue, the TARDIS materializes.)

BRIGADIER LETHBRIDGE STEWART:(Smiles.) Come on out, Doctor.

(The door opens and JO and the DOCTOR step out.)

BRIGADIER LETHBRIDGE STEWART: Well, that was a short trip. You'll never get that thing working properly.

(The BRIGADIER crosses the lab and picks up a report that he brought in with him.)

BRIGADIER LETHBRIDGE STEWART: Oh, you were right about that report, I'm afraid. It wasn't the Master after all.JO:(To the DOCTOR, puzzled.) He's talking as if we'd never been away.DOCTOR: As far as he's concerned, we haven't. The TARDIS returned to Earth just a few seconds after it left.BRIGADIER LETHBRIDGE STEWART: What are you two talking about?DOCTOR: Don't try and explain Jo. He'd never understand.